Programmatically set Input Method on text box

["Jeremy 123" <j2r2my gmail com>]

Dear list,
I'm working on a program that has some Greek text boxes, and some English
text boxes.  I would like to be able to programmatically set the Greek text
boxes to use a Greek input method and the English ones to use an English
input method, so that the user doesn't have to manually switch input methods
depending on which box he or she is typing in.  Is there a way to do this?
Thanks very much,
Jeremy